On Sat, 29 Sep 2007 02:12:13 -0500, msg wrote:

clifto wrote:

COLIN LAMB wrote:

Ok, finally found a single tube 100 kHz. crystal oscillator that uses a neon
bulb relaxation oscillator that is synchronized to achieve 10 kHz signals.


Phase Locked Lightbulbs?


Not really so bizarre; there are stories of certain computers with light-
sensitive neon bulbs in the logic that were affected by ceiling fluorescent
lighting when panels were removed from the racks...

Regards,

Michael
The trigger point does shift with light or RF. Black paint on the lamp
will take care of the light.

In my "junk that should have been thrown away" I have a frequency
counter that I built from an artical in QST many years back that used
10 neons per digit. Many years after the fact I realized that it might
have been more practical if the Neon high voltage had been gated off
during the counting phase and on only to display the count. But then
it would not have looked nearly as impressive during operation.

John Ferrell W8CCW
"Life is easier if you learn to
plow around the stumps".